a make or break week for president obama and governor romney. hunkering down, cramming for the big debate. what are their secrets to land the knockout punch? >>> peanut butter. a massive recall expanding tonight. we'll tell you which symptoms could spell trouble for you and your family. >>> and, oscar stunner. the new host for the academy awards. not a movie star. why fans of the "family guy" are having the last laugh tonight. >> victory is mine! >>> good evening from "world news." and we begin with breaking news. an american airlines plane has been forced to land under strange circumstances. a whole row of seats shaken loose,passengers upended. and this is the second time seats have come loose and forced a landing in three days. so, what is going on? for the latest on what happened today, let's go right to abc's senior national correspondent, jim avila. >> 685, what can i do for you? >> roger. got an unusual one for you. >> reporter: no one can remember this happening before. not passengers, so rattled they didn't want to be identified. >> the